4620 SEAHURST AVE 2020-05-20 - Laserfiche WebLink

No.7—Energy Dissipaters Maintenance Defect Conditions When Maintenance is Needed Results Expected When Components Maintenance is Performed Rock Pad Missing or Only one layer of rock exists above native Rock pad replaced to design Moved Rock soil in area five square feet or larger,or any standards. exposure of native soil where pad was originally installed. Erosion Soil erosion-in or adjacent to rock pad. Rock pad replaced to design standards. Rock Gabion Wire basket Deterioration determined to be near to Rewire area of concern or replace Structures matrix breaking.Broken wire results in hole large basket and/or rocks as necessary deteriorated enough to allow rocks to protrude out of or broken basket Wire basket Baskets have shifted and no longer providing Realign or relocate as necessary to misaligned full energy dissipations or may be prone to meet design intent tipping or collapse Dispersion Trench Perforated Accumulated sediment that exceeds 20%of Pipe cleaned/flushed so that it Pipe Plugged the design depth or over 1/3 of perforations matches design. with in pipe are plugged. Sediment Not Water is discharging at a few concentrated Trench redesigned or rebuilt to Discharging points along the top of the trench rather than standards. Water flowing uniformly along the entire length of Properly trench lip. —Distributor" Water is observed or reported to be flowing Facility rebuilt or redesigned to Catch Basin out of top of basin during any storm less than standards. Overflows the design storm. Receiving Water in receiving area is causing or has No danger of landslides. Area Over- potential of causing landslide problems. Saturated Catch Basins Other Defects See-Catch Basins"(No.5). See—Catch Basins"(No.5). September 2010 Snohomish County Drainage Manual Volume V-Runoff Treatment BMPs 35